first_order_unsteady_solver.h

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2025 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner

// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.

// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

#ifndef LIBMESH_FIRST_ORDER_UNSTEADY_SOLVER_H
#define LIBMESH_FIRST_ORDER_UNSTEADY_SOLVER_H

#include "libmesh/unsteady_solver.h"

namespace libMesh
{
class FirstOrderUnsteadySolver : public UnsteadySolver
{
public:
  explicit
  FirstOrderUnsteadySolver (sys_type & s)
    : UnsteadySolver(s) {}

  virtual ~FirstOrderUnsteadySolver () = default;

  virtual unsigned int time_order() const override
  { return 1; }

  virtual void integrate_qoi_timestep() override = 0;

#ifdef LIBMESH_ENABLE_AMR
  virtual void integrate_adjoint_refinement_error_estimate(AdjointRefinementEstimator & adjoint_refinement_error_estimator, ErrorVector & QoI_elementwise_error) override = 0;
#endif // LIBMESH_ENABLE_AMR

protected:

  void prepare_accel(DiffContext & context);

  bool compute_second_order_eqns(bool compute_jacobian, DiffContext & c);

};

} // end namespace libMesh

#endif // LIBMESH_FIRST_ORDER_UNSTEADY_SOLVER_H